Return the number of distinct values in a list of integers. Return 0 for a null or empty list.
Examples:
Input: nums = [1, 2, 2, 3, 3, 3]
Output: 3
Explanation: The distinct values are 1, 2 and 3
Input: nums = [5, 5, 5]
Output: 1
Explanation: Only the value 5 is present
Input: nums = [1, 2, 3, 4]
Output: 4
Explanation: All values are already unique
Input: nums = []
Output: 0
Explanation: An empty list has no distinct values
Input: nums = null
Output: 0
Explanation: Null input returns 0
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